JPH05268374A - Line terminal equipment - Google Patents

Abstract

PURPOSE:To eliminate the replacement of a line terminal equipment due to revision of communication specifications of a center side and a terminal equipment side after the installation and to reduce mis-wiring when plural terminal equipments are connected. CONSTITUTION:A communication protocol between a center side 1 and a terminal equipment 10 is inputted from an external input terminal 6 and the communication protocol is stored in a communication protocol storage section 7. A signal transmission control section 8 makes communication between the center side and the terminal equipment based on the communication protocol.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a line terminal device connected between a line and a terminal device for connecting a terminal device such as a meter with a communication function to a public line.

[0002]

2. Description of the Related Art A conventional line terminal device of this type, as shown in FIG. 3, is a public line 1, a connection terminal 12, a line control unit 15 including a network control unit 13 and a transmission / reception unit 14, and a predetermined communication procedure. Is composed of a terminal device (gas meter with communication function, water meter, electric power meter, etc.) 18 and a signal transmission unit 16 for transmitting / receiving transmission / reception signals of the transmission / reception unit 14.

[0003]

However, in the above-mentioned configuration, when the terminal device 18 is changed, for example, the gas meter with a communication function is changed to a water meter, or the gas meter with a communication function is changed. When the communication specifications are changed, or when connecting to a center with different communication specifications, it is necessary to replace the line terminal device because the predetermined communication procedure does not match.

FIG. 4 and FIG. 5 show specific examples of the above-mentioned modification of the communication specifications. 4 and 5, the vertical thick line is
Each indicates a center, a line terminal device, and a terminal device, and arrows indicate directions of signal transmission. In the procedure of FIG. 4, the line terminal device transmits the signal received from the center to the terminal device, while the data received from the terminal device is
This is the procedure for transmitting to the center.

In the procedure of FIG. 5, the line terminal device transmits a response to the signal received from the center to the center, and then transmits the data received from the center in the same procedure as in FIG. This modification is an example and may be modified in various procedures.

In a line terminal device having a plurality of signal transmission units 16 and transmitting with a plurality of terminal devices 18,
Since each signal transmission unit 16 is determined by a predetermined field communication procedure, it is necessary to connect to the determined signal transmission unit 16, and wiring may be erroneously performed.

The present invention solves such a conventional problem, and eliminates the need to replace the line terminal device due to the change of the communication specifications on the center side and the terminal device side after the installation, and connects a plurality of terminal devices. The purpose is to reduce miswiring by connecting and then inputting a communication procedure.

[0008]

To achieve the above object, the first means of the present invention is connected between a line and a terminal device to connect the terminal device to a public line, A line control unit including a connection terminal unit for connecting to a line, a network control unit, and a transmission / reception unit, an external input terminal for inputting a terminal communication procedure for communicating with the terminal device, and a communication procedure storage unit for storing the terminal communication procedure. And a signal transmission control unit for transmitting / receiving a transmission / reception unit signal of the transmission / reception unit of the line control unit to / from the terminal device according to the communication procedure of the communication procedure storage unit.

Further, a second means of the present invention is that the external input terminal is the line control section.

[0010]

According to the present invention, with the above configuration, the signal from the line is transmitted to the transmission / reception unit via the connection terminal of the line control unit and the network control, and the terminal from the signal transmission control unit to the terminal according to the communication procedure of the communication procedure storage unit. Transmitted to the device. On the contrary, the signal from the terminal device is transmitted to the signal transmission control unit and is sent to the line via the line control unit according to the communication procedure of the communication procedure storage unit. When the communication specifications of the terminal equipment or the communication specifications of the center are changed, the communication procedure is input from the external input terminal and stored in the communication procedure storage section, so that the communication specifications of the terminal or the center are changed. It is possible to carry out the communication that has existed.

[0011]

Embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a functional block diagram of a line terminal device according to an embodiment of the present invention. The same numbers as those in FIG. 3 indicate components having the same names and functions.

The line controller 5 includes a connection terminal 2 and a network controller 3.
And a transceiver unit 4. Reference numeral 7 is a communication reference storage unit for storing communication procedures, and 6 is an external input terminal for inputting the stored communication procedures from the outside of the line terminal device. Reference numeral 8 is a signal transmission control unit that performs transmission with the line control unit 5 or the terminal device 10 according to the communication procedure of the communication procedure storage unit 7.

With this configuration, a communication procedure is input from the external input terminal 6, and the signal transmission control section 8 performs transmission with the line control section 5 or the terminal device 10 according to the communication procedure stored in the communication procedure storage section 7. By storing various communication procedures in the communication procedure storage unit 7, it becomes possible to perform transmission between the center side and the terminal device side by various communication procedures.

Next, another embodiment of the present invention is shown in FIG.
The same reference numerals as those in FIG. 1 indicate components having the same names and functions. The line control unit 5 is an external input terminal for inputting a communication procedure. With this configuration, various communication procedures are sent from the center to the communication procedure storage unit 7 via the line control unit 5. The communication procedure storage unit 7 stores this procedure. According to the communication procedure stored in the communication procedure storage unit 7, the signal transmission control unit 8 transmits with the line control unit 5 or the terminal device 10. According to this, the communication procedure can be remotely input from the center side without inputting the communication procedure at the site.

As the communication procedure storage section here, a method using a static RAM or an EEPROM can be considered.

Since the communication procedure can be input and stored from the outside, the hardware of the line terminal device is not changed,
It is possible to communicate with a center or terminal device of any communication specifications.

[0018]

As described above, according to the line terminal device of the present invention, the following effects can be obtained.

(1) When the terminal device is changed after the line terminal device is installed (for example, a gas meter with a communication function is changed to a water meter), the communication specifications of the terminal device and the center are changed, or communication is performed. When the number of centers with different specifications increases, it is not necessary to replace the line terminal device because communication can be performed by inputting the communication procedure with the line terminal device installed.

(2) In a line terminal device having a plurality of terminals that can be connected to the terminal device, since the communication procedure can be input even after the terminal device is connected, connection mistakes are eliminated.

(3) It is possible to easily cope with communication procedures of various centers and terminal devices without changing the hardware of the line terminal device, and the system can be installed and constructed quickly.

[Brief description of drawings]

FIG. 1 is a functional block diagram of a line terminal device according to a first embodiment of the present invention.

FIG. 2 is a functional block diagram of a line terminal device according to a second embodiment of the present invention.

FIG. 3 is a conventional functional block diagram.

[Figure 4] Explanatory diagram showing an example of communication procedure

[Figure 5] Explanatory diagram showing an example of communication procedure

[Explanation of symbols]

 1 line 2 connection terminal 3 network control unit 4 transmission / reception unit 5 line control unit 6 external input terminal 7 communication procedure storage unit 8 signal transmission control unit 9 line terminal device 10 terminal device

Claims (2)

[Claims] 1. A line control unit connected between a line and a terminal device for connecting a terminal device to a public line, the connection terminal unit connecting to the public line, a network control unit, and a transmission / reception unit; An external input terminal for inputting a terminal communication procedure for communicating with a terminal device, a communication procedure storage section for storing the terminal communication procedure, and a line control section for communication between the terminal apparatus according to the communication procedure of the communication procedure storage section. A line terminal device comprising a signal transmission control unit for transmitting / receiving a transmission / reception signal of a transmission / reception unit. 2. The line control section as an external input terminal as claimed in claim 1.
The described line terminal device.